The market might be vulnerable, but it doesn't pay -- at least in the long term -- to bet against the managers of some of this era's great growth companies, says TheStreet'sJim Cramer, Portfolio Manager of the Action Alerts PLUS Charitable Trust Portfolio,.

There's several stocks that fit this bill, according to Cramer, who took viewer questions from the floor of the New York Stock Exchange. First he discussed Under Armour (UA) - Get Report . Shares are soaring Thursday, up more than 20%, after the company beat on earnings-per-share and revenue expectations. 

Although Cramer is cautious on Under Armour in the short term due to concerns over discounting, he didn't waver over the company's long-term prospects.

"Don't bet against [CEO] Kevin Plank," he said, adding that Plank will be a guest on his "Mad Money" show in the near future.

Marc Benioff, the CEO of (CRM) - Get Report , is another executive who investors shouldn't bet against, Cramer said. Some investors are looking at the recent disappointing earnings results from ServiceNow (NOW) - Get Report in an attempt to connect the dots to Salesforce.

That's not a good comparison, Cramer said, highlighting that Salesforce is the best in its business and he expects a "remarkable" quarter from the company. 

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Finally, Cramer said investors should refrain from betting against Amazon (AMZN) - Get Report . In all likelihood, the company had a "huge holiday season," but it's not worth the risk to speculate, Cramer said.

Amazon is one of the tech group Cramer nicknamed the "FANG stocks" -- the others being Facebook (FB) - Get Report , Netflix (NFLX) - Get Report and Alphabet (GOOGL) - Get Report . Facebook, an Action Alerts PLUS holding, reported earnings on Wednesday after the close. It's up 15% on Thursday. 

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Facebook's growth is amazing, and it's bringing the valuation down, but that doesn't make it the cheapest in the group, Cramer said. Instead, the cheapest stock is Alphabet -- another Action Alerts PLUS holding -- which also has above-market growth. Those are Cramer's two FANG stock picks to stick with.

Finally, Cramer touched on Freeport-McMoRan (FCX) - Get Report , which has been crushed over the past year -- down 75%. Freeport is certainly one of the stocks that belong in the "Distressed Index," which features fabulous work by RealMoney contributors Carleton English and James Passeri, Cramer concluded.

Cramer answers viewers' questions in a daily segment with TheStreetTV. Send your questions to him on his Facebook page, or on Twitter (TWTR) - Get Report . Send questions to him @JimCramer with the hashtag #CramerQ. 

At the time of publication, Cramer's Action Alerts PLUS had a long position in FB, GOOGL and TWTR.